ex99_3.htm

November 28, 2012

British Columbia Securities Commission

Alberta Securities Commission

Saskatchewan Financial Services Commission

The Manitoba Securities Commission

Ontario Securities Commission

Autorité des marchés financiers (Québec)

New Brunswick Securities Commission

Nova Scotia Securities Commission

Securities Commission of Newfoundland and Labrador

The Prince Edward Island Securities Office,

Office of the Attorney General

Office of the Superintendent of Securities, Department of Justice,

Government of the Northwest Territories

Yukon Securities Office, Corporate Affairs,

Government of Yukon

Registrar of Securities, Department of Justice

Government of Nunavut

Dear Sirs / Mesdames:

We have read the statements made by Thomson Reuters Corporation in the attached copy of change of auditor notice dated November 28, 2012, which we understand will be filed pursuant to Section 4.11 of National Instrument 51-102.

We agree with the statements in the change of auditor notice dated November 28, 2012.

Yours very truly,

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP, PricewaterhouseCoopers Center, 300 Madison Ave, New York, NY, 10017